Improvement in the manufacture of contrate-wheels



NITED STATES ATPATENT OFFICE.,

HENRY J. nAvIEs, OE BROOKLYN, NEw YORK, AND WALTER D. DAVIEs,

OE ANsONrA, CONNECTICUT.

IMPROVEMENT IN TH'E"M ANUFACTURE OF CONTRATE-WHEELS.n

Specification forming part of Letters Patent No. 209,664, dated November5, 1878; application led October 2, 1878.

To all whom it may concern:

Be it known that we, HENRY J. DAVIEs, of the city of Brooklyn, county ofKings and State of New York, and WALTER I). DAVIES, of the town ofAnsonia, county oi' New Haven and State of Connecticut, have inventedce1'- tain new and useful Improvements in Contrate- Wheels for Clock andWatch Movements; and

we do hereby declare that the following specif represents, in sectionalviews, a pair of open swagin g-dies with the wheel-blank laid there,Fig. 4 illustrating the dies as closed and the wheel-blank as formedinto shape; and Fig. 5 is a perspective view of my improved wheel as aiinished product.

Contrate-wheels, or such as .have their cogs or teeth projecting at anangle to the plane of their bodies, otherwise commonly known as crown77.or face wheels,77 are ordinarily made by milling out the center of acircular blank of suitable dimensions and thickness, so as to leave aright-angular flange projecting from the outer edge thereof, whichflange is then provided with teeth or eogs by means of a cutting-tool,which forms tooth after tooth until the wheel is complete. It has alsobeen usual to cast the blank with a projecting right-angular flange, andthen cut tooth after tooth .thereon by the ordinary gear-cuttingmachine.

In this mode of producing such wheels great expense both in time andlabor is involved, whereby the cost of the product is necessarily muchgreater than is that of any other of its companion Wheels used in awatch or clock movement.

This invention consists in an improved method of making contrate-wheels,and in the improved contrate wheel produced thereby, all

- of which is too particularly hereinafter explained to need preliminarydescription.

' I In the production of our improved contrate- ,wheel a numberofcircular blanks or disks, 2, having central bearings 8, preferably cutfrom suitable sheet metal rolled out to a proper thickness, but whichmay be cast, if desired, are iirst converted into toothed wheels bycutting appropriate teeth on theirperipheries. This Vis done bystringing a number of the blanks upon a mandrel and clamping themtightly thereon side by side, where they form a compact body. Toothafter tooth is then cut throughout this body of blanks in like manner asif a single blank were being treated, so that when the body ofi blanksis detached from the mandrel each constitutes a toothed wheel, 3, asshown in Fig..2.` Such'atoothed wheel is placed in the bed-piece 4.0i apair of swaging-dies, being properly centered therein by dropping itover a spindle, ll, which projects upward from said bed-piece 4. Theopening or die in this bed-piece4 is of the size and shape of theexterior surfaces of the contratewheel to be formed, and thc punch 5,whichis adapted to co-operate with it, conforms in dimensions and shapeto that of the inner surfaces of said contrate-wheel, the punch having acentral perforation, 10, which tits over the spindle 11, and serves as aguide, causing it to properly co-operate therewith as it descends intothe die in the bed-piece 4.

The punch 5, as it descends, presses the wheel 3 into the die 4, causingthe edges of said wheel to be pressed onto the inclined mouth of saiddie, and thus be bent upward over the edge of the punch 5 on the line 1,which upsetting of the edge of said wheel conv tinues until the punch 5reaches the limit of its downward movement, when the body 7 of the wheel3 will rest upon the face of the die 4 and lie between it and the faceof the punch 5, while the edge ot' the wheel will have been upturned soas to form the toothed iiange 9, which will lie between the verticalsides of the said die 4 and punch 5, as seen in Fig. 4. By thisoperation the toothed wheel 3 will have had its outer edge turned upwardat au angle to its body 7, thus providing it with a cogged or toothedflange, 9, standing at an appropriate angle to the plane of its body,whereby is constituted a contrate-wheel such as is shown by a sectionalview in Fig. 5 and in perspective in Fig. 6.

As is obvious, the swaging-dies may be constructed and operated in anyapproved manner. The general construction shown is, however, anadvantageous one, since, by the use of the spindle 11, an accuratecentering of the blank or wheel is insured, and the teeth or cogs of theiian ge 9 are brought into the same plane or lie evenly with respect toeach other. The improved contrate -wheel thus formed from a sheet-metalblank whose toothed periphery is drawn or swaged so as to constitute anangular toothed flan ge possesses great advantages over the commonconstruction of such wheels. It is composed of a single piece ofhomogeneous metal, the iibers of which are disposed in such lines by theprocess of drawing as to impart the greatest strength possessed by themetal to the toothed angular ilange. Such a wheel is without aws whichfrequently result from casting blanks, and is not liable to rupture fromcracks often occasioned by the milling out of a blank.

In consequence of the method of their construction, the blanks for theseimproved wheels may be readily eut from the rolled sheet metal ofcommerce, be provided with teeth, and then bent into cup form, so as tocomplete the wheel with the utmost economy of material and manipulation,thus enabling one to produce contrate-wheels without cutting away anyportion of the body of the blank save that necessary to provide it withteeth, which wheels possess a maximum degree of strength, are accuratein form, superior in finish, and are produced at a muchless cost thancontrate-wheels as now commonly made.

' Vhat we claim, therefore, is-

l. The method of making contrate-wheels, the same consisting in firstconverting a flat circular metal blank into a toothed Wheel by cuttingsuitable teeth or cogs in its periphery, and then swaging or upsettingthe outer edge thereof, so that it shall stand at an angle to the, planeof the body of the Wheel, substantially as described.

2. As a new article of manufacture, a contrate-wheel consisting of asheet-metal body, 7, whose toothed edge is swaged or upset so as toconstitute a toothed ange, 9, standing at an angle to said body 7,substantially as described.

In testimony whereofl we have signed our names to this specication inthe presence of two subscribing witnesses.

' HENRY J. DAVIES.

,WALTER D. DAVIES.

Witnesses as to the signature of H. J. Da-

vies:

H. T. MUNsoN, GEO. H. GRAHAM.

Witnesses as to the signature of W. D. Davies:

WM. POWE, J. W. DREW.

